Monodomain liquid crystal elastomers and elastomeric gels: Improved thermomechanical responses and phase behaviour by addition of low molecular weight LCs

Monodomain liquid crystal elastomers and elastomeric gels: Improved thermomechanical responses and phase behaviour by addition of low molecular weight LCs
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单畴液晶弹性体和弹性体凝胶:通过添加低分子量液晶改善热机械响应和相行为

DOI:
10.1016/j.matchemphys.2007.04.036
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发表时间:
2007
影响因子:
4.6
通讯作者:
Brown D
Brown D
中科院分区:
材料科学3区
文献类型:
--
作者:
Brown D

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大型单畴液晶弹性体薄膜已使用机械取向制备,无论是作为纯材料还是作为掺杂低分子量手性液晶的凝胶。已在一定温度范围内研究了所得材料的热机械应变行为。当在近晶 A 相中进行机械排列时,就达到了最大的热应变,正好低于向表观各向同性液相的转变。纯弹性体在较宽的温度范围(约 60°C)内表现出热机械响应,而掺杂低分子量 LC 的弹性体凝胶在较窄的温​​度范围(约 15°C)内表现出明显更尖锐的热机械响应。
Large monodomain-liquid crystal elastomer films have been prepared using mechanical alignment, either as pure materials or as gels doped with low molecular weight chiral liquid crystals. The thermomechanical strain behaviour of the resulting materials has been studied over a range of temperatures. The largest thermal strains have been achieved when the mechanical alignment was carried out in the smectic A phase, just below the transition to the apparent isotropic liquid phase. The pure elastomers exhibit thermomechanical responses over broad temperature ranges (ca. 60°C), however the elastomer gels doped with a low molecular weight LC exhibit significantly sharper thermomechanical responses over a narrower temperature range (ca. 15°C).
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